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氧含量变化对Ti-6Al-4V钛合金高周疲劳行为的影响

Effect of Oxygen Variation on High Cycle Fatigue Behavior of Ti-6Al-4V Titanium Alloy.

作者信息

Tang Luyao, Fan Jiangkun, Kou Hongchao, Tang Bin, Li Jinshan

机构信息

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China.

National & Local Joint Engineering Research Center for Precision Thermoforming Technology of Advanced Metal Materials, Xi'an 710072, China.

出版信息

Materials (Basel). 2020 Sep 1;13(17):3858. doi: 10.3390/ma13173858.

DOI:10.3390/ma13173858
PMID:32882907
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7503640/
Abstract

The element oxygen is expected to be a low-cost, strengthening element of titanium alloys due to its strong solid solution strengthening effect. High cycle fatigue behaviors of Ti-6Al-4V alloys with different oxygen contents (0.17%, 0.20%, 0.23% wt.%) were investigated in this paper. The results illustrated that Ti-6Al-4V-0.20O alloy possesses the highest fatigue strength and the lowest fatigue crack propagation rate. The fatigue fracture morphology verified that the fatigue cracks propagated transgranularly in both Ti-6Al-4V-0.17O and Ti-6Al-4V-0.20O alloys, and the fatigue cracks tended to extend intergranularly in the Ti-6Al-4V-0.23O alloy. The maximum nano-hardness varied from the <0001> direction to the <1¯21¯0> and <011¯0> directions with the increasing oxygen content, which suggested that the dominant slip system varied from prismatic slip to pyramidal slip. The number of the <c→+a→> type dislocations increased with the oxygen content, which indicated that the number of the first-order pyramidal and the second-order pyramidal <c→+a→> slip systems increased. The oxygen can significantly change the fatigue fracture mechanism of Ti-6Al-4V alloy: From transgranular fracture to intergranular fracture. These results are expected to provide valuable reference for the optimization of the composition and mechanical properties of titanium alloys.

摘要

由于氧元素具有强烈的固溶强化作用，有望成为钛合金的低成本强化元素。本文研究了不同氧含量（0.17%、0.20%、0.23%重量百分比）的Ti-6Al-4V合金的高周疲劳行为。结果表明，Ti-6Al-4V-0.20O合金具有最高的疲劳强度和最低的疲劳裂纹扩展速率。疲劳断口形貌证实，Ti-6Al-4V-0.17O和Ti-6Al-4V-0.20O合金中的疲劳裂纹均沿穿晶扩展，而Ti-6Al-4V-0.23O合金中的疲劳裂纹倾向于沿晶界扩展。随着氧含量的增加，最大纳米硬度从<0001>方向到<1¯21¯0>和<011¯0>方向发生变化，这表明主导滑移系从棱柱滑移转变为棱锥滑移。<c→+a→>型位错的数量随氧含量增加，这表明一阶棱锥和二阶棱锥<c→+a→>滑移系的数量增加。氧可显著改变Ti-6Al-4V合金的疲劳断裂机制：从穿晶断裂转变为沿晶断裂。这些结果有望为钛合金成分和力学性能的优化提供有价值的参考。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27ef/7503640/2d1742e89924/materials-13-03858-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27ef/7503640/6e6b29be6869/materials-13-03858-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27ef/7503640/8fdb2458cd47/materials-13-03858-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27ef/7503640/8112bb6b8ca7/materials-13-03858-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27ef/7503640/5aea8021970d/materials-13-03858-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27ef/7503640/951d9e37c318/materials-13-03858-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27ef/7503640/d5b25a6a28c2/materials-13-03858-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27ef/7503640/e3f1baa3c138/materials-13-03858-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27ef/7503640/910bd8a5c373/materials-13-03858-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27ef/7503640/2d1742e89924/materials-13-03858-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27ef/7503640/6e6b29be6869/materials-13-03858-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27ef/7503640/8fdb2458cd47/materials-13-03858-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27ef/7503640/8112bb6b8ca7/materials-13-03858-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27ef/7503640/5aea8021970d/materials-13-03858-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27ef/7503640/951d9e37c318/materials-13-03858-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27ef/7503640/d5b25a6a28c2/materials-13-03858-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27ef/7503640/e3f1baa3c138/materials-13-03858-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27ef/7503640/910bd8a5c373/materials-13-03858-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27ef/7503640/2d1742e89924/materials-13-03858-g009.jpg

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